1/*
  2 * Copyright 2013 Red Hat Inc.
  3 *
  4 * Permission is hereby granted, free of charge, to any person obtaining a
  5 * copy of this software and associated documentation files (the "Software"),
  6 * to deal in the Software without restriction, including without limitation
  7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8 * and/or sell copies of the Software, and to permit persons to whom the
  9 * Software is furnished to do so, subject to the following conditions:
 10 *
 11 * The above copyright notice and this permission notice shall be included in
 12 * all copies or substantial portions of the Software.
 13 *
 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 20 * OTHER DEALINGS IN THE SOFTWARE.
 21 *
 22 * Authors: Dave Airlie
 23 *          Alon Levy
 24 */
 25
 26#include <linux/pci.h>
 27
 28#include <drm/drm_irq.h>
 29
 30#include "qxl_drv.h"
 31
 32irqreturn_t qxl_irq_handler(int irq, void *arg)
 33{
 34	struct drm_device *dev = (struct drm_device *) arg;
 35	struct qxl_device *qdev = (struct qxl_device *)dev->dev_private;
 36	uint32_t pending;
 37
 38	pending = xchg(&qdev->ram_header->int_pending, 0);
 39
 40	if (!pending)
 41		return IRQ_NONE;
 42
 43	atomic_inc(&qdev->irq_received);
 44
 45	if (pending & QXL_INTERRUPT_DISPLAY) {
 46		atomic_inc(&qdev->irq_received_display);
 47		wake_up_all(&qdev->display_event);
 48		qxl_queue_garbage_collect(qdev, false);
 49	}
 50	if (pending & QXL_INTERRUPT_CURSOR) {
 51		atomic_inc(&qdev->irq_received_cursor);
 52		wake_up_all(&qdev->cursor_event);
 53	}
 54	if (pending & QXL_INTERRUPT_IO_CMD) {
 55		atomic_inc(&qdev->irq_received_io_cmd);
 56		wake_up_all(&qdev->io_cmd_event);
 57	}
 58	if (pending & QXL_INTERRUPT_ERROR) {
 59		/* TODO: log it, reset device (only way to exit this condition)
 60		 * (do it a certain number of times, afterwards admit defeat,
 61		 * to avoid endless loops).
 62		 */
 63		qdev->irq_received_error++;
 64		DRM_WARN("driver is in bug mode\n");
 65	}
 66	if (pending & QXL_INTERRUPT_CLIENT_MONITORS_CONFIG) {
 67		schedule_work(&qdev->client_monitors_config_work);
 68	}
 69	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
 70	outb(0, qdev->io_base + QXL_IO_UPDATE_IRQ);
 71	return IRQ_HANDLED;
 72}
 73
 74static void qxl_client_monitors_config_work_func(struct work_struct *work)
 75{
 76	struct qxl_device *qdev = container_of(work, struct qxl_device,
 77					       client_monitors_config_work);
 78
 79	qxl_display_read_client_monitors_config(qdev);
 80}
 81
 82int qxl_irq_init(struct qxl_device *qdev)
 83{
 84	int ret;
 85
 86	init_waitqueue_head(&qdev->display_event);
 87	init_waitqueue_head(&qdev->cursor_event);
 88	init_waitqueue_head(&qdev->io_cmd_event);
 89	INIT_WORK(&qdev->client_monitors_config_work,
 90		  qxl_client_monitors_config_work_func);
 91	atomic_set(&qdev->irq_received, 0);
 92	atomic_set(&qdev->irq_received_display, 0);
 93	atomic_set(&qdev->irq_received_cursor, 0);
 94	atomic_set(&qdev->irq_received_io_cmd, 0);
 95	qdev->irq_received_error = 0;
 96	ret = drm_irq_install(&qdev->ddev, qdev->ddev.pdev->irq);
 97	qdev->ram_header->int_mask = QXL_INTERRUPT_MASK;
 98	if (unlikely(ret != 0)) {
 99		DRM_ERROR("Failed installing irq: %d\n", ret);
100		return 1;
101	}
102	return 0;
103}